Shift tray unit



FIG. 1 is a front elevation of a shift tray unit showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation thereof;

FIG. 6 is a top, front, and left side perspective view thereof; and,

FIG. 7 is a top, front and left side perspective view, the broken line showing of a laser printer is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for the shift tray unit, as shown and described. 